General Knoppix support for those who've read the FAQ at the Wiki
New Cisco w/ Green Hologram SFP-25G-SR-S 25G SFP28 SR 850nm 300m LC MMF Module
$69.99
New Sealed Cisco GLC-TE 1000BASE-T RJ45 SFP Transceiver module *US Shipping*
$20.00
Moxa NPort 5610-16 16 Port RS-232 Serial Device Server 1201056100030
$115.50
BROCADE ICX6610-24F-E 24-port 1 GbE SFP Switch
$75.95
ProLabs 10GBase-TX SFP+ RJ-45 Copper Transceiver Module P/N: SFP-10GBASE-T-C
$19.99
Genuine Cisco SFP-10G-SR V03 10GBASE-SR SFP+ Transceiver Module 10-2415-03
$8.00
GENUINE Cisco SFP-10G-SR V03 SFP+ GBIC Transceiver Module 10-2415-03
$6.80
Brand New Cisco GLC-LH-SMD 1000BASE-LX/LH SFP Module 1310nm 10km SMF LC
$10.99
Fully Compatible 10G SFP ZR SFP+Module Transceiver 1550nm SMF 80km LC Dupelx
$120.60
CISCO CONVERTER MODULE CVR-X2-SFP10G 74-6321-02
$24.99